Excited-state absorption in thulium-doped materials in the near-infrared

Author:

Guillemot Lauren1ORCID,Loiko Pavel1,Doualan Jean-Louis1,Braud Alain1,Camy Patrice1

Affiliation:

1. Université de Caen Normandie

Abstract

Excited-state absorption (ESA) is a key process for upconversion pumping schemes of thulium (Tm3+) doped laser materials. We have systematically studied two ESA transitions in the near-infrared spectral range, namely 3F43F2,3 (at ∼1 µm) and 3F43H4 (at ∼1.5 µm), in various Tm3+-doped fluoride (ZBLAN glass, cubic KY3F10 and CaF2, tetragonal LiYF4 and LiLuF4, monoclinic BaY2F8 crystals) and oxide (cubic Y3Al5O12, orthorhombic YAlO3 crystals) laser materials, using a pump-probe method with a polarized light. An approach to calculate the constants of energy-transfer upconversion (ETU) is also presented.

Funder

European Science Foundation

Région Normandie

Agence Nationale de la Recherche

Publisher

Optica Publishing Group

Subject

Atomic and Molecular Physics, and Optics

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